While the app is still down for some users, a Snapchat representative has told TNW:

We are working hard to solve this issue as quickly as possible and are very sorry for the inconvenience this is causing our community and partners.

Update 2 (22:49 GMT):

Snapchat has sent a second statement, confirming resolution:

We’re happy to share that as of 12:06 pm PT, the outage that prevented some Snapchatters from posting and viewing Snaps and Stories have been resolved. We apologize for the frustration this caused, and we are working hard to prevent future outages.